/*******************************************************************************
 * Copyright 2017 Bstek
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License.  You may obtain a copy
 * of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations under
 * the License.
 ******************************************************************************/
package com.bstek.urule.console;

import com.bstek.urule.Utils;
import com.bstek.urule.console.servlet.RequestContext;
import org.springframework.context.ApplicationContext;

import java.util.Collection;


/**
 * @author Jacky.gao
 * @since 2015年1月6日
 */
public class EnvironmentUtils {
    private static EnvironmentProvider environmentProvider;

    public static User getLoginUser(RequestContext context) {
        if (environmentProvider == null) {
            initEnvironmentProvider();
        }
        return environmentProvider.getLoginUser(context);
    }

    public static void initEnvironmentProvider() {
        ApplicationContext context = Utils.getApplicationContext();
        Collection<EnvironmentProvider> providers = context.getBeansOfType(EnvironmentProvider.class).values();
        if (providers.size() == 0) {
            environmentProvider = new DefaultEnvironmentProvider();
        } else {
            environmentProvider = providers.iterator().next();
        }
    }

    public static EnvironmentProvider getEnvironmentProvider() {
        if (environmentProvider == null) {
            initEnvironmentProvider();
        }
        return environmentProvider;
    }
}
